Valentine's Day - What a Massacre!

One of the most popular and commercialised 'events' of the year, Valentine's Day is when we are all supposed to celebrate the love we share with our partner - on a day that is associated particularly with the massacre of several men during a gang conflict ... how on earth did this come about?!

Fairly long questions, and info from the redoubtable www.snopes.com, www.st-valentines-day.com and a selection of other websites, books, etc.